The triquetra has been found on runestones in Northern Europe and on early Germanic coins. It presumably had pagan religious meaning and it bears a resemblance to the Valknut, a symbol associated with Odin.
G Scale Trains are usually referred to as Garden Trains since they are the largest of the model trains and are used outdoors as well as indoors.
The scale of a model is it's size relative to the size of the real version. So compared to a 1:24 scale model, the real version is 24 times larger in size or 1:1 in scale. Example; In the pictures below... The model on top is 1:18 Scale, which means it is one eighteenth the size of the real thing.